JP5671874B2 - Wireless tag - Google Patents
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- JP5671874B2 JP5671874B2 JP2010179264A JP2010179264A JP5671874B2 JP 5671874 B2 JP5671874 B2 JP 5671874B2 JP 2010179264 A JP2010179264 A JP 2010179264A JP 2010179264 A JP2010179264 A JP 2010179264A JP 5671874 B2 JP5671874 B2 JP 5671874B2
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- 239000004020 conductor Substances 0.000 claims description 161
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 239000002184 metal Substances 0.000 description 130
- 229910052751 metal Inorganic materials 0.000 description 130
- 238000007740 vapor deposition Methods 0.000 description 35
- 238000004891 communication Methods 0.000 description 25
- 230000005404 monopole Effects 0.000 description 10
- 230000008878 coupling Effects 0.000 description 8
- 238000010168 coupling process Methods 0.000 description 8
- 238000005859 coupling reaction Methods 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 5
- 230000005672 electromagnetic field Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/04—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the shape
- G06K19/041—Constructional details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/04—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the shape
- G06K19/041—Constructional details
- G06K19/042—Constructional details the record carrier having a form factor of a credit card and including a small sized disc, e.g. a CD or DVD
- G06K19/045—Constructional details the record carrier having a form factor of a credit card and including a small sized disc, e.g. a CD or DVD the record carrier being of the non-contact type, e.g. RFID, and being specially adapted for attachment to a disc, e.g. a CD or DVD
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
- G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
- G11B23/0028—Details
- G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
- G11B23/0042—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving with provision for auxiliary features
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Support Of Aerials (AREA)
- Waveguide Aerials (AREA)
- Near-Field Transmission Systems (AREA)
Description
本発明は、非接触によりリーダライタと送受信を行う無線タグのアンテナ技術に関する。 The present invention relates to an antenna technology of a wireless tag that performs transmission and reception with a reader / writer without contact.
ＵＨＦ帯（８６０〜９６０ＭＨｚ）の無線回線を用いてリーダライタから約１Ｗの信号を送信し、無線タグ側でその信号を受信し、再びリーダライタ側へ応答信号を送り返すことにより、無線タグ内の情報をリーダライタで読み取ることができるＲＦＩＤシステムが既に知られている。国内では、９５２〜９５４ＭＨｚの無線周波数が用いられる。通信距離は、無線タグのアンテナゲイン、無線ＩＣチップの動作電圧、リーダライタのアンテナゲイン、周囲環境にもよるが、およそ３〜１０ｍ程度である。この無線タグは、アンテナと、アンテナの給電点に接続される無線ＩＣチップ（約０．５ｍｍ角程度）とで構成される。
無線タグでは、アンテナパターンが透明フィルムシート上に印刷、エッチング等によって形成される。アンテナの給電点には、特別な整合回路を実装することなくＩＣチップが接続される。
By transmitting a signal of about 1 W from the reader / writer using a UHF band (860 to 960 MHz) wireless line, receiving the signal on the wireless tag side, and returning a response signal to the reader / writer side again, RFID systems that can read information with a reader / writer are already known. In Japan, a radio frequency of 952 to 954 MHz is used. The communication distance is about 3 to 10 m although it depends on the antenna gain of the wireless tag, the operating voltage of the wireless IC chip, the antenna gain of the reader / writer, and the surrounding environment. This wireless tag includes an antenna and a wireless IC chip (about 0.5 mm square) connected to a feeding point of the antenna.
In a wireless tag, an antenna pattern is formed on a transparent film sheet by printing, etching, or the like. An IC chip is connected to the feeding point of the antenna without mounting a special matching circuit.
図１に示すように、無線ＩＣチップ（以下、単に「ＩＣチップ」という。）は、内部抵抗Ｒｃ（例えば１７００Ω）とキャパシタンスＣｃ（例えば１．０ｐＦ）との並列回路で等価的に表わすことができる。また、アンテナは、放射抵抗Ｒａ（例えば２０００Ω）と、インダクタンスＬａ（例えば３０ｎＨ）の並列回路で等価的に表わすことができる。ＩＣチップとアンテナを並列接続することにより、キャパシタンスＣｃとインダクタンスＬａとが共振し、所望の共振周波数ｆｏ（例えば９５３ＭＨｚ）でインピーダンス整合する。これにより、アンテナでの受信電力がＩＣチップへ最大に供給される。上記共振周波数ｆｏは、1/(2π*(La*Cc)1/2)で表される。 As shown in FIG. 1, a wireless IC chip (hereinafter simply referred to as “IC chip”) is equivalently represented by a parallel circuit of an internal resistance Rc (for example, 1700Ω) and a capacitance Cc (for example, 1.0 pF). it can. The antenna can be equivalently represented by a parallel circuit of a radiation resistance Ra (for example, 2000Ω) and an inductance La (for example, 30 nH). By connecting the IC chip and the antenna in parallel, the capacitance Cc and the inductance La resonate and impedance matching is performed at a desired resonance frequency fo (for example, 953 MHz). Thereby, the reception power at the antenna is supplied to the IC chip to the maximum. The resonance frequency fo is represented by 1 / (2π * (La * Cc) 1/2 ).
段ボールやプラスチック等、非導電性部材（又は非金属部材）に無線タグを貼り付ける場合、無線タグのアンテナとしては、ダイポール部をメアンダ状にしたダイポールアンテナ（λ／２として全長約１４０ｍｍ程度）が適用されることが多い。この場合、無線タグの大きさは１０ｃｍ×２ｃｍ程度である。 When a wireless tag is affixed to a non-conductive member (or non-metallic member) such as cardboard or plastic, the antenna of the wireless tag is a dipole antenna with a dipole portion in a meander shape (λ / 2 is about 140 mm in total length). Often applied. In this case, the size of the wireless tag is about 10 cm × 2 cm.
ところが、１０ｃｍ×２ｃｍ程度の大きさの無線タグを、ＣＤやＤＶＤ等のディスク状の記録媒体に貼り付けようとすると、記録媒体の円環状のデータ記録面の金属部（記録面金属部）と平面視でオーバーラップしてしまう。すなわち、記録媒体の円環状の記録面金属部は、内径φ３６ｍｍ〜４０ｍｍであり、外径約φ１２０ｍｍ（ほぼ記録媒体自体の外径と等しい。）であるため、１０ｃｍ×２ｃｍの無線タグを取り付けると両者はオーバーラップする。そうなると、記録面金属部の遮蔽効果により、無線タグとリーダライタが全く無線通信できなくなる。 However, when a wireless tag having a size of about 10 cm × 2 cm is to be attached to a disk-shaped recording medium such as a CD or DVD, a metal portion (recording surface metal portion) of the annular data recording surface of the recording medium It overlaps in plan view. That is, since the annular recording surface metal portion of the recording medium has an inner diameter of 36 mm to 40 mm and an outer diameter of about 120 mm (approximately equal to the outer diameter of the recording medium itself), a 10 cm × 2 cm wireless tag is attached. Both overlap. Then, the wireless tag and the reader / writer cannot communicate at all due to the shielding effect of the recording surface metal part.
そこで、従来、ＣＤやＤＶＤ等のディスク状の記録媒体に貼り付けるために好適な無線タグが提案されている。この無線タグは、そのモノポールアンテナがディスク状の記録媒体の内周側の非導電部材（具体的には、透明プラスチック部）上に配置されるように、記録媒体に貼り付けられる。また、この無線タグの円環状の平板グランド部の一部が、記録媒体の記録面金属部と平面視でオーバーラップすることで、両者が電磁結合するように構成されている。これにより、記録媒体の記録面金属部を高周波においてグランドとみなすことができ、リーダライタと十分に無線通信ができるようになっている。 Therefore, conventionally, a wireless tag suitable for being attached to a disc-shaped recording medium such as a CD or a DVD has been proposed. This wireless tag is affixed to a recording medium such that the monopole antenna is disposed on a non-conductive member (specifically, a transparent plastic part) on the inner circumference side of the disk-shaped recording medium. Further, a part of the annular flat plate ground portion of the wireless tag overlaps the recording surface metal portion of the recording medium in a plan view so that both are electromagnetically coupled. As a result, the recording surface metal portion of the recording medium can be regarded as a ground at a high frequency, and wireless communication with the reader / writer can be sufficiently performed.
ところで、従来提案されている上記無線タグは、ディスク状の記録媒体の記録面金属部の内径としてφ３６ｍｍ〜４０ｍｍの範囲を想定しており、その範囲内でモノポールアンテナを構成していた。しかしながら、近年、記録面金属部よりもさらに内周側に蒸着金属部が設けられたディスク状の記録媒体が市場で見られるようになった。この蒸着金属部の内径はφ２０ｍｍ〜２７ｍｍの範囲で確認されている。記録面金属部と蒸着金属部を含むディスク状の記録媒体の構造を図２に示す。 By the way, the said wireless tag proposed conventionally assumed the range of (phi) 36mm-40mm as an internal diameter of the recording surface metal part of a disk-shaped recording medium, and comprised the monopole antenna within the range. However, in recent years, a disk-shaped recording medium in which a vapor deposition metal portion is provided further on the inner peripheral side than the recording surface metal portion has come to be seen in the market. The inner diameter of the vapor-deposited metal part is confirmed in the range of φ20 mm to 27 mm. FIG. 2 shows the structure of a disk-shaped recording medium including a recording surface metal part and a vapor deposition metal part.
このような金属部の内径が小さい記録媒体では、記録媒体の内周側の非導電部材のみからなる領域が狭く、モノポールアンテナを実装することが困難である。例えば、従来のモノポールアンテナを円環状の狭い領域に形成しようとすると、モノポール部を円環状の領域内で２重又は３重に巻くようにして形成するか、モノポール部の線幅を細くしてメアンダ状に形成すること等が考えられる。しかし、そのようなモノポールアンテナの形成方法では、リーダライタとの通信距離が大幅に低下することは避けられない。 In such a recording medium having a small inner diameter of the metal portion, a region made only of a non-conductive member on the inner peripheral side of the recording medium is narrow, and it is difficult to mount a monopole antenna. For example, when a conventional monopole antenna is to be formed in a narrow annular region, the monopole portion is formed so as to be wound twice or triple in the annular region, or the line width of the monopole portion is reduced. For example, it may be formed into a meander shape. However, in such a method for forming a monopole antenna, the communication distance with the reader / writer is inevitably reduced.
よって、発明の１つの側面では、平面視で非導電部材からなる領域が狭いディスク状の記録媒体に設けた場合に、通信距離が大幅に低下しない無線タグを提供することを目的とする。 Therefore, an object of one aspect of the present invention is to provide a wireless tag that does not significantly reduce a communication distance when it is provided on a disk-shaped recording medium having a narrow region made of a non-conductive member in plan view.
非導電部材からなる内周側の第１領域と、導電部材を含む外周側の第２領域とからなるディスク状の記録媒体、に取り付けられる無線タグが提供される。
この無線タグは、
（Ａ）無線ＩＣチップに接続される給電部と、
（Ｂ）スロットが設けられた導体板を含み、前記給電部から給電されるスロットアンテナと、を備える。
導体板は、無線タグを記録媒体の内周側に取り付けた場合に、少なくとも一部が記録媒体の前記第２領域とオーバーラップするように形成される。スロットの長さは、スロットアンテナが無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られるように設定される。
There is provided a wireless tag attached to a disc-shaped recording medium composed of a first area on the inner circumference side made of a non-conductive member and a second area on the outer circumference side containing a conductive member.
This wireless tag
(A) a power feeding unit connected to the wireless IC chip;
(B) a slot antenna including a conductor plate provided with a slot and fed from the feeding section.
The conductor plate is formed so that at least a part thereof overlaps the second region of the recording medium when the wireless tag is attached to the inner peripheral side of the recording medium. The length of the slot is set so that an inductance is obtained such that the slot antenna resonates with the wireless IC chip at a predetermined radio frequency.
開示の無線タグによれば、平面視で非導電部材からなる領域が狭いディスク状の記録媒体に設けた場合に、通信距離が大幅に低下しない。 According to the disclosed wireless tag, the communication distance is not significantly reduced when the wireless tag is provided on a disk-shaped recording medium having a narrow area made of a non-conductive member in plan view.
以下、実施例に係る無線タグについて説明する。なお、特記しない限り、寸法の単位はミリメートル[mm]とする。 Hereinafter, the wireless tag according to the embodiment will be described. Unless otherwise specified, the unit of dimensions is millimeter [mm].
（１）第１実施例
図３は、第１実施例の無線タグの構成を示す。この無線タグでは、円環状（ドーナツ状）の導体板１０にスロット（溝）１１を設けることでスロットアンテナが構成されている。スロット１１は、前記給電部から両側に延びており、全体として円弧状のメアンダ形状をなしている。導体板１０は例えば、Ｃｕ，Ａｇ，及びＡｌのいずれかを材料とする導体である。メアンダ状のスロット１１の中央近傍にはＩＣチップが実装される給電部２が設けられている。ＩＣチップは、導体板１０内に埋め込まれている。
(1) First Example FIG. 3 shows a configuration of a wireless tag according to a first example. In this wireless tag, a slot antenna is formed by providing a slot (groove) 11 in an annular (doughnut-shaped) conductor plate 10. The slot 11 extends on both sides from the power feeding portion, and has an arcuate meander shape as a whole. The conductor plate 10 is a conductor made of, for example, any one of Cu, Ag, and Al. In the vicinity of the center of the meander-shaped slot 11, a power feeding unit 2 on which an IC chip is mounted is provided. The IC chip is embedded in the conductor plate 10.
スロットアンテナは一般に、モノポールアンテナとは可逆的である。つまり、モノポールアンテナでは、所望のインダクタンス成分（図１に示したＬａ）を持たせるために長さをλ／２よりも長くするが、スロットアンテナでは、所望のインダクタンス成分を持たせるために長さをλ／２よりも短くすれば済む。すなわち、図３において、スロット１１は、給電部２から両端までのスロット長がそれぞれλ／４よりも短くなっている。そのため、スロットアンテナでは、仮にモノポールアンテナを円弧状のメアンダ状にした場合の外径と比較して、円弧状のメアンダ形状としたスロットの外径を小さくすることが可能となっている。 Slot antennas are generally reversible with monopole antennas. That is, in the monopole antenna, the length is longer than λ / 2 in order to have a desired inductance component (La shown in FIG. 1), whereas in the slot antenna, the length is long in order to have a desired inductance component. It is sufficient to make the length shorter than λ / 2. That is, in FIG. 3, the slot 11 has a slot length from the power feeding unit 2 to both ends shorter than λ / 4. For this reason, in the slot antenna, it is possible to reduce the outer diameter of the arc-shaped meander-shaped slot as compared with the outer diameter when the monopole antenna is formed in an arc-shaped meander shape.
図３に示すように、本実施例において、スロット１１のメアンダ形状は、複数のＶ字形状部が円弧状に連結されて形成されている。メアンダ形状を構成するのにＶ字形を適用するのは、隣接するＶ字形状部のスロットの外側の導体を流れる電流の向きは逆であるものの、互いに逆向きの電流ベクトル方向が斜めとなり、逆向きの電流によって生ずる電磁波のキャンセル量を低減できるためである。これにより、例えばメアンダ形状を構成するのにＵ字形の部分を複数連結する場合と比較して、アンテナ実効長を長くすることができ、スロット１１の外径を小さくすることができる。 As shown in FIG. 3, in this embodiment, the meander shape of the slot 11 is formed by connecting a plurality of V-shaped portions in an arc shape. The V-shape is applied to construct the meander shape, although the direction of the current flowing through the conductor outside the slot of the adjacent V-shaped portion is opposite, but the current vector directions opposite to each other are diagonal, This is because the amount of cancellation of electromagnetic waves generated by the direction current can be reduced. Thereby, for example, compared with the case where a plurality of U-shaped portions are connected to form a meander shape, the effective antenna length can be increased and the outer diameter of the slot 11 can be reduced.
図４は、図３に示した無線タグを、ディスク状の記録媒体の一例としてＣＤ(Compact Disk)に貼り付けた状態を示している。図４に示すように、無線タグは、ＣＤの読み取り面とは逆側の面（いわゆるレーベル面）において、内周側の中心穴部の周囲に貼り付けられる。無線タグのＣＤに対する貼付け方法は問わないが、例えば極薄の両面テープ、接着剤、シール等が貼付けのために使用され得る。 FIG. 4 shows a state where the wireless tag shown in FIG. 3 is attached to a CD (Compact Disk) as an example of a disk-shaped recording medium. As shown in FIG. 4, the wireless tag is attached to the periphery of the center hole on the inner peripheral side on the surface opposite to the CD reading surface (so-called label surface). A method for attaching the wireless tag to the CD is not limited, but for example, an ultra-thin double-sided tape, an adhesive, a seal, or the like can be used for attachment.
貼付け対象のＣＤのプラスチック部には、蒸着金属部が埋め込まれている。以下の説明において、ＣＤにおいて平面視で、蒸着金属部又は記録面金属部よりも内周側の領域、すなわち、非導電部材からなる内周側の領域を「第１領域」という。ＣＤにおいて平面視で、蒸着金属部又は記録面金属部などの導電部材を含む外周側の領域を「第２領域」という。また、蒸着金属部と記録面金属部を総称して「金属部」という。
ここで、図４（ｂ）に見られるように、導体板１０は、無線タグを記録媒体の内周側に取り付けた場合に、少なくとも一部がＣＤのプラスチック部に埋め込まれた蒸着金属部とオーバーラップするような外形で形成されている。すなわち、導体板１０は、ＣＤの第２領域の内径よりも大きい外径で形成され、かつ少なくとも一部がＣＤの第２領域とオーバーラップするように貼り付けられる。
A vapor deposition metal part is embedded in the plastic part of the CD to be pasted. In the following description, a region on the inner peripheral side of the vapor deposition metal portion or the recording surface metal portion in the plan view of the CD, that is, an inner peripheral region made of a non-conductive member is referred to as a “first region”. A region on the outer periphery side including a conductive member such as a vapor deposition metal part or a recording surface metal part in a plan view of the CD is referred to as a “second region”. The vapor deposition metal part and the recording surface metal part are collectively referred to as “metal part”.
Here, as seen in FIG. 4 (b), the conductive plate 10 has a vapor-deposited metal portion at least partially embedded in the plastic portion of the CD when the wireless tag is attached to the inner peripheral side of the recording medium. It is formed with an external shape that overlaps. That is, the conductor plate 10 is formed so as to have an outer diameter larger than the inner diameter of the second region of the CD, and is attached so that at least a part thereof overlaps the second region of the CD.
導体板１０と蒸着金属部（ＣＤの第２領域）をオーバーラップさせることで、高周波帯において、導体板１０はＣＤの蒸着金属部、さらには蒸着金属部に接続された記録面金属部（図２参照）と電磁結合する。すなわち、高周波帯ではＣＤの金属部を導体板１０の一部として機能させることができ、スロット１１から十分に電波を放射させることができる。それゆえ、本実施例の無線タグはそれ自体コンパクトではあるが、リーダライタ（図示せず）との間の十分な有効通信距離を確保することができる。 By overlapping the conductor plate 10 and the vapor deposition metal part (the second region of the CD), the conductor plate 10 in the high frequency band has the metal plate of the CD, and further the recording surface metal part connected to the vapor deposition metal part (see FIG. 2). That is, in the high frequency band, the metal part of the CD can function as a part of the conductor plate 10, and radio waves can be sufficiently emitted from the slot 11. Therefore, although the wireless tag of this embodiment is compact in itself, a sufficient effective communication distance with a reader / writer (not shown) can be secured.
図５は、無線タグの寸法の一例を、ＣＤの寸法と関連付けて示している。図５において、Ｄ１はＣＤの中心穴部の内径である。Ｄ２及びＤ３はそれぞれ、円弧状のメアンダ形状としたスロットの内径及び外径である。Ｄ４はＣＤの蒸着金属部の内径である。Ｄ５は導体板１０の外径である。この寸法例では、導体板１０と蒸着金属部（ＣＤの第２領域）とがオーバーラップするように、すなわちＤ４＜Ｄ５が成立するようにして、導体板１０の外径が設定されている。なお、図５に示す例ではＤ４＝φ２４であるが、発明者らの調査によれば、Ｄ４としてφ２０〜２７の範囲のＣＤの存在が確認されている。そこで、Ｄ５はＤ４の採り得る最大値（Ｄ４＝φ２７）よりも大きく設定されている。 FIG. 5 shows an example of the dimension of the wireless tag in association with the dimension of the CD. In FIG. 5, D1 is the inner diameter of the center hole of the CD. D2 and D3 are the inner and outer diameters of the arc-shaped meander-shaped slot, respectively. D4 is the inner diameter of the deposited metal part of the CD. D5 is the outer diameter of the conductor plate 10. In this dimension example, the outer diameter of the conductor plate 10 is set so that the conductor plate 10 and the vapor deposition metal part (the second region of the CD) overlap, that is, D4 <D5 is established. In the example shown in FIG. 5, D4 = φ24. However, according to the investigation by the inventors, the presence of a CD in the range of φ20 to 27 is confirmed as D4. Therefore, D5 is set larger than the maximum value that can be taken by D4 (D4 = φ27).
また、図５に示す寸法例では、Ｄ３≦Ｄ４、すなわち、メアンダ形状としたスロットの外径を蒸着金属部の内径以下としている。このようにスロットの外径を形成することは、スロットからの電波が蒸着金属部により遮蔽されることがなく、有効通信距離を十分に確保する点で好ましい。 Further, in the dimension example shown in FIG. 5, D3 ≦ D4, that is, the outer diameter of the meander-shaped slot is set to be equal to or smaller than the inner diameter of the vapor deposition metal portion. Forming the outer diameter of the slot in this way is preferable in that a radio wave from the slot is not shielded by the deposited metal part and a sufficient effective communication distance is secured.
図５におけるθは、円環状の無線タグの中心点と給電点とを結ぶ線を基準にして、スロットが形成されていない領域を示す、当該線からの角度である。このθ（０°〜３０°）と周波数（９００〜１０００ＭＨｚ）をパラメータとして入力し、市販の電磁界シミュレータで計算し、プロットした結果を図６に示す。なお、この計算では、ＩＣチップ側の回路素子に関し、Ｒｃ＝１７００Ω、Ｃｃ＝１．０ｐＦ（Ｒｃ、Ｃｃについては図１参照）としている。図６では、（ａ）θとアンテナのインダクタンスＬａとの関係、（ｂ）無線周波数と有効通信距離(Read Range)との関係、をそれぞれ示している。図６に示すように、無線タグで使用される周波数をｆｏ＝９５３ＭＨｚとするとＬａ＝２７ｎＨで共振し、Ｌａを２７ｎＨとするためにはθ＝１５°にすれば良いことが分かる。このとき、有効通信距離は十分長い距離（４ｍ）となる。 In FIG. 5, θ is an angle from the line indicating a region where no slot is formed with reference to a line connecting the center point of the annular wireless tag and the feeding point. This θ (0 ° to 30 °) and frequency (900 to 1000 MHz) are input as parameters, calculated with a commercially available electromagnetic field simulator, and the plotted results are shown in FIG. In this calculation, Rc = 1700Ω and Cc = 1.0 pF (refer to FIG. 1 for Rc and Cc) for the circuit elements on the IC chip side. FIG. 6 shows (a) the relationship between θ and the antenna inductance La, and (b) the relationship between the radio frequency and the effective communication distance (Read Range). As shown in FIG. 6, when the frequency used in the wireless tag is fo = 953 MHz, resonance occurs at La = 27 nH, and in order to set La to 27 nH, it is understood that θ = 15 ° may be set. At this time, the effective communication distance is a sufficiently long distance (4 m).
なお、第１実施例の無線タグの形状とは異なり、導体板１０とＣＤの蒸着金属部とをオーバーラップさせないとした場合（すなわち、Ｄ４＞Ｄ５）には、高周波帯において、導体板１０はＣＤの金属部と電磁結合せず、有効通信距離が１ｍ程度に止まる。 Unlike the shape of the wireless tag of the first embodiment, when the conductor plate 10 and the deposited metal part of the CD are not overlapped (that is, D4> D5), the conductor plate 10 is It is not electromagnetically coupled with the metal part of the CD, and the effective communication distance is limited to about 1 m.
（２）第２実施例
図７は、第２実施例の無線タグの構成を示す。この無線タグは、第１実施例で想定したＣＤとは蒸着金属部の内径Ｄ４が異なるＣＤに貼り付けられることが意図されている。図７に示すように、本実施例において、貼付け対象のＣＤではＤ４＝φ２０であり、蒸着金属部の内径Ｄ４がスロットの外径Ｄ３よりも小さくなっている（Ｄ３＞Ｄ４）。
(2) Second Example FIG. 7 shows a configuration of a wireless tag according to a second example. This wireless tag is intended to be affixed to a CD having a different inner diameter D4 of the vapor deposition metal part from the CD assumed in the first embodiment. As shown in FIG. 7, in this example, in the CD to be pasted, D4 = φ20, and the inner diameter D4 of the vapor deposition metal part is smaller than the outer diameter D3 of the slot (D3> D4).
本実施例においても、前述したθ（０°〜３０°）と周波数（９００〜１０００ＭＨｚ）をパラメータとして入力し、市販の電磁界シミュレータで計算し、プロットした。その結果を図８に示す。なお、この計算では、ＩＣチップ側の回路素子に関し、Ｒｃ＝１７００Ω、Ｃｃ＝１．０ｐＦとしている。図８では図６同様、（ａ）θとアンテナのインダクタンスＬａとの関係、（ｂ）無線周波数と有効通信距離(Read Range)との関係、をそれぞれ示している。図８に示すように、無線タグで使用される周波数をｆｏ＝９５３ＭＨｚとするとＬａ＝２７ｎＨで共振し、Ｌａを２７ｎＨとするためにはθ＝２８°にすれば良いことが分かる。このとき、有効通信距離は３．２ｍとなる。
本実施例では、有効通信距離が第１実施例の場合よりも低下したが、無線タグとしての機能上何ら問題ないレベルとなっている。すなわち、スロットアンテナのスロットの外径が、貼付け対象のディスク状の記録媒体の金属部の内径よりも大きい場合であっても、スロットの形状（具体的には上記θの角度）を適切に設定すれば、十分な有効通信距離を確保することができる。
なお、θ＝２８°のスロットを備えた第２実施例の無線タグは、蒸着金属部の内径Ｄ４がφ２０のＣＤに最適化されたものであり、第１実施例で想定した蒸着金属部の内径Ｄ４がφ２４のＣＤに適用することは好ましくない。共振条件が崩れ、有効通信距離が低下するためである。
Also in this example, the aforementioned θ (0 ° to 30 °) and frequency (900 to 1000 MHz) were input as parameters, calculated with a commercially available electromagnetic field simulator, and plotted. The result is shown in FIG. In this calculation, Rc = 1700Ω and Cc = 1.0 pF for the circuit element on the IC chip side. FIG. 8 shows (a) the relationship between θ and the antenna inductance La, and (b) the relationship between the radio frequency and the effective communication distance (Read Range), respectively. As shown in FIG. 8, when the frequency used in the wireless tag is fo = 953 MHz, resonance occurs at La = 27 nH, and in order to set La to 27 nH, it is understood that θ = 28 ° may be set. At this time, the effective communication distance is 3.2 m.
In this embodiment, the effective communication distance is lower than that in the first embodiment, but it is at a level that does not cause any problem in terms of function as a wireless tag. That is, even when the outer diameter of the slot of the slot antenna is larger than the inner diameter of the metal portion of the disk-shaped recording medium to be pasted, the slot shape (specifically, the angle of θ described above) is set appropriately. Then, a sufficient effective communication distance can be secured.
Note that the wireless tag of the second embodiment having a slot of θ = 28 ° is optimized for a CD having an inner diameter D4 of the vapor deposition metal portion of φ20, and is the same as that of the vapor deposition metal portion assumed in the first embodiment. It is not preferable to apply to a CD having an inner diameter D4 of φ24. This is because the resonance condition collapses and the effective communication distance decreases.
（３）第３実施例
第１実施例の無線タグがＣＤに貼り付けられた場合に導体板１０とＣＤの金属部の電磁結合を生じさせるため、第１実施例の無線タグでは、導体板１０とＣＤの蒸着金属部がオーバーラップするように導体板１０の外径を設定していた。さらに、第１実施例の無線タグでは、導体板１０の全周に亘る外縁でＣＤの蒸着金属部とオーバーラップするように、円環状の導体板１０が形成されていた。しかしながら、蒸着金属部がないＣＤ（すなわち、記録面金属部のみが存在するＣＤ）の記録面金属部に対して、円環状の導体板の全周に亘る外縁でオーバーラップさせようとすると、導体板に使用される金属成分の量が過大となり、好ましくない。すなわち、導体板は例えばＡｇペーストによる印刷で製造されるが、導体板に使用されるＡｇペーストの使用量が多くなると、無線タグの原価上昇を招来する。そこで、蒸着金属部がないＣＤに貼り付ける無線タグでは、導体板１０とＣＤの記録面金属部とのオーバーラップ領域の面積を少なくすることで、導体板１０の占める面積を極力低減することが望まれる。
(3) Third Embodiment In order to cause electromagnetic coupling between the conductor plate 10 and the metal part of the CD when the wireless tag of the first embodiment is attached to a CD, the wireless tag of the first embodiment has a conductor plate. The outer diameter of the conductor plate 10 was set so that 10 and the vapor deposition metal part of CD overlapped. Further, in the wireless tag of the first embodiment, the annular conductor plate 10 is formed so as to overlap the vapor deposition metal portion of the CD at the outer edge over the entire circumference of the conductor plate 10. However, if the recording surface metal portion of a CD having no vapor deposition metal portion (that is, a CD having only the recording surface metal portion) is overlapped with the outer edge over the entire circumference of the annular conductor plate, the conductor The amount of the metal component used for the plate becomes excessive, which is not preferable. That is, the conductor plate is manufactured, for example, by printing with Ag paste. However, when the amount of Ag paste used for the conductor plate increases, the cost of the wireless tag increases. Therefore, in a wireless tag attached to a CD having no vapor deposition metal part, the area occupied by the conductor plate 10 can be reduced as much as possible by reducing the area of the overlap region between the conductor plate 10 and the recording surface metal part of the CD. desired.
かかる観点から、図９に、蒸着金属部がないＣＤに貼り付けるために好適な無線タグの一例として、第３実施例の無線タグの構成を示す。図９に示す導体板１０では、例えば第１実施例で示した外径Ｄ５の円環状の導体板に対し、４箇所に延長部１０１が設けられている。この延長部１０１は、導体板１０とＣＤの記録面金属部とをオーバーラップさせる目的で設けられている。このように、導体板１０の少なくとも一部がＣＤの記録面金属部とオーバーラップしていれば、導体板１０とＣＤの記録面金属部との電磁結合により、十分な有効通信距離が確保できる。 From this point of view, FIG. 9 shows the configuration of the wireless tag of the third embodiment as an example of a wireless tag suitable for being attached to a CD having no vapor deposition metal part. In the conductor plate 10 shown in FIG. 9, for example, the extension portions 101 are provided at four locations with respect to the annular conductor plate having the outer diameter D5 shown in the first embodiment. The extension portion 101 is provided for the purpose of overlapping the conductor plate 10 and the recording surface metal portion of the CD. Thus, if at least a part of the conductor plate 10 overlaps the CD recording surface metal portion, a sufficient effective communication distance can be secured by electromagnetic coupling between the conductor plate 10 and the CD recording surface metal portion. .
（４）第４実施例
第４実施例の無線タグは、第３実施例同様、蒸着金属部がないＣＤに貼り付けるために好適な無線タグの一例であり、その構成を図１０に示す。図１０に示すように、本実施例の無線タグの導体板１０は、少なくとも一部がＣＤの記録面金属部とオーバーラップするような矩形形状にて形成される。典型的には、導体板１０は正方形である。
本実施例の無線タグの導体板１０も第３実施例同様、導体板１０を円環状に形成させてその外周の全領域でＣＤの記録面金属部とオーバーラップさせた場合と比較して、例えば導体板に使用されるＡｇペーストの使用量を低減することができる。
(4) Fourth Embodiment The wireless tag of the fourth embodiment is an example of a wireless tag suitable for being attached to a CD having no vapor deposition metal part, as in the third embodiment, and its configuration is shown in FIG. As shown in FIG. 10, the conductor plate 10 of the wireless tag according to the present embodiment is formed in a rectangular shape so that at least a part of the conductor plate 10 overlaps the recording surface metal part of the CD. Typically, the conductor plate 10 is square.
Compared to the case where the conductor plate 10 of the wireless tag of the present embodiment is also formed like a ring like the third embodiment, the conductor plate 10 is formed in an annular shape and overlaps with the recording surface metal portion of the CD in the entire outer periphery thereof, For example, the amount of Ag paste used for the conductor plate can be reduced.
（５）第５実施例
第５実施例の無線タグは、第３及び第４実施例同様、蒸着金属部がないＣＤに貼り付けるために好適な無線タグの一例であり、その構成を図１１に示す。図１１に示す無線タグは、導体板１０を円環状に形成させてその全周に亘る外縁でＣＤの記録面金属部とオーバーラップさせている点で、第３及び第４実施例と異なる。そして、その円環状の導体板１０には、スロット１１よりも外周側の領域において、１又は複数の孔部が設けられている。ここで、導体板１０において記録面金属部とオーバーラップしている領域とスロット１１とが連通する限り、孔部の形状及び数は任意に設定することができる。本実施例のように、導体板１０に孔部を設けることで、導体板１０を円環状に形成させてその全周に亘る外縁でＣＤの記録面金属部とオーバーラップさせつつ、導体板に使用されるＡｇペーストの使用量を低減させることができる。
(5) Fifth Embodiment The wireless tag of the fifth embodiment is an example of a wireless tag suitable for being attached to a CD having no vapor deposition metal part, as in the third and fourth embodiments. Shown in The wireless tag shown in FIG. 11 is different from the third and fourth embodiments in that the conductor plate 10 is formed in an annular shape and overlaps with the recording surface metal part of the CD at the outer edge over the entire circumference. The annular conductor plate 10 is provided with one or a plurality of holes in a region on the outer peripheral side of the slot 11. Here, as long as the area | region which overlaps with the recording surface metal part in the conductor plate 10 and the slot 11 connect, the shape and number of a hole part can be set arbitrarily. As in this embodiment, by providing a hole in the conductor plate 10, the conductor plate 10 is formed in an annular shape and overlapped with the recording surface metal portion of the CD at the outer edge over the entire circumference. The amount of Ag paste used can be reduced.
（６）第６実施例
第１実施例の無線タグがＣＤに貼り付けられた場合に導体板１０とＣＤの金属部の電磁結合を生じさせるため、第１実施例の無線タグでは、導体板１０とＣＤの蒸着金属部がオーバーラップするように導体板１０の外径を設定していた。そのため、蒸着金属部がないＣＤに対して、第１実施例の無線タグを貼り付けると、蒸着金属部よりも内径の大きい記録面金属部とは導体板１０がオーバーラップせず、導体板１０と記録面金属部とで電磁結合を生じさせることができない。ＣＤのタイプ（蒸着金属部の有無）に応じて２種類の無線タグ（例えば第１実施例の無線タグと第３実施例の無線タグ）を用意し、その２種類の無線タグをＣＤのタイプに応じて貼り分ければよいが煩雑である。２種類の無線タグを用意すればコストも掛かる。
(6) Sixth Embodiment In order to cause electromagnetic coupling between the conductive plate 10 and the metal part of the CD when the wireless tag of the first embodiment is attached to a CD, the wireless tag of the first embodiment has a conductive plate. The outer diameter of the conductor plate 10 was set so that 10 and the vapor deposition metal part of CD overlapped. Therefore, when the wireless tag of the first embodiment is attached to a CD having no vapor deposition metal part, the conductor plate 10 does not overlap with the recording surface metal part having a larger inner diameter than the vapor deposition metal part. And the recording surface metal part cannot be electromagnetically coupled. Two types of wireless tags (for example, the wireless tag of the first embodiment and the wireless tag of the third embodiment) are prepared according to the type of CD (the presence or absence of the deposited metal part), and the two types of wireless tags are designated as the CD type. It may be complicated depending on the situation, but it is complicated. If two types of wireless tags are prepared, costs will increase.
かかる観点から、図１２に示す本実施例の無線タグでは、導体板１０（主導体部）とは別体で補助導体部１５が設けられる。例えば、本実施例の無線タグは、第１実施例の無線タグに対して、別体で補助導体部１５が設けられたものである。また、補助導体部１５は、本実施例の無線タグがＣＤに貼り付けられた状態で導体板１０を取り囲むような形状で形成された、円環状の導体板である。より具体的には、補助導体部１５は、本実施例の無線タグがＣＤに貼り付けられた状態で、第１実施例の導体板１０の外縁でオーバーラップするとともに、ＣＤの記録面金属部の内縁とオーバーラップするようにして形成される。これにより、実質的に導体板１０の導体領域が拡大される。
なお、導体板１０と補助導体部１５はＤＣ上で絶縁されていてもよい。例えば、導体板１０と補助導体部１５がそれぞれビニール素材等でラッピングされており、両者がオーバーラップする部分で導体間の直接的な接触がない場合でも構わない。
図５に示した第１実施例の無線タグの寸法、及び記録面金属部の内径がφ４０のＣＤの寸法を前提とすると、補助導体部１５の内径は例えばφ２６、外径は例えばφ４２である。
From this point of view, in the wireless tag of this embodiment shown in FIG. 12, the auxiliary conductor portion 15 is provided separately from the conductor plate 10 (main conductor portion). For example, the wireless tag of the present embodiment is one in which the auxiliary conductor portion 15 is provided separately from the wireless tag of the first embodiment. The auxiliary conductor portion 15 is an annular conductor plate formed in a shape surrounding the conductor plate 10 in a state where the wireless tag of this embodiment is attached to the CD. More specifically, the auxiliary conductor portion 15 overlaps with the outer edge of the conductor plate 10 of the first embodiment in a state where the wireless tag of the present embodiment is attached to the CD, and the recording surface metal portion of the CD. It is formed so as to overlap with the inner edge. Thereby, the conductor area | region of the conductor board 10 is expanded substantially.
In addition, the conductor plate 10 and the auxiliary conductor part 15 may be insulated on DC. For example, the conductor plate 10 and the auxiliary conductor portion 15 may be wrapped with a vinyl material or the like, respectively, and there may be no direct contact between the conductors at the overlapping portion.
Assuming the size of the wireless tag of the first embodiment shown in FIG. 5 and the size of the CD whose inner diameter of the recording surface metal portion is φ40, the inner diameter of the auxiliary conductor portion 15 is, for example, φ26, and the outer diameter is, for example, φ42. .
第６実施例の無線タグは、以下のとおり使用される。すなわち、蒸着金属部があるＣＤに対しては例えば第１実施例の無線タグが貼り付けられ、蒸着金属部がないＣＤに対しては本実施例の無線タグを貼り付けるようにする。このとき、本実施例の無線タグのＣＤに対する貼り付けは、補助導体部１５を先ずＣＤのレーベル面に貼り付け、その上に第１実施例の無線タグを貼り付けることでなされる。すなわち、１種類の無線タグ（例えば第１実施例の無線タグ）を用意しておき、補助導体部１５を付加するか否かによって、ＣＤのタイプ（蒸着金属部の有無）に応じた無線タグをＣＤに設定することができるようになる。そのため、無線タグを２種類用意するよりも低コスト化を図ることができる。
なお、本実施例の無線タグの基礎となる無線タグ、すなわち補助導体部１５が付加されていない状態の無線タグとして第１実施例の無線タグを想定したが、これに限られない。基礎となる無線タグの構成、形状は、蒸着金属部があるＣＤに適したものであればよく、例えば第２実施例の無線タグでもよい。その場合には、前述したθが調整される。
The wireless tag of the sixth embodiment is used as follows. That is, for example, the wireless tag of the first embodiment is attached to a CD having a vapor deposition metal portion, and the wireless tag of this embodiment is attached to a CD having no vapor deposition metal portion. At this time, the wireless tag of the present embodiment is attached to the CD by first attaching the auxiliary conductor portion 15 to the label surface of the CD and then attaching the wireless tag of the first embodiment thereon. That is, one type of wireless tag (for example, the wireless tag of the first embodiment) is prepared, and a wireless tag corresponding to the type of CD (the presence or absence of a vapor deposition metal portion) depending on whether or not the auxiliary conductor portion 15 is added. Can be set to CD. Therefore, the cost can be reduced as compared with the case where two types of wireless tags are prepared.
In addition, although the wireless tag of 1st Example was assumed as a wireless tag used as the basis of the wireless tag of a present Example, ie, the wireless tag in which the auxiliary conductor part 15 is not added, it is not restricted to this. The configuration and shape of the base wireless tag may be anything suitable for a CD having a vapor-deposited metal portion, and may be the wireless tag of the second embodiment, for example. In that case, the aforementioned θ is adjusted.
（７）第７実施例
第７実施例の無線タグは、第６実施例の無線タグと同様の観点で形成されている。本実施例の無線タグは、補助導体部１５の形態が第６実施例のものと異なる。図１３に本実施例の無線タグの構成を示す。図１３に示すように、本実施例の無線タグは、ＣＤに貼り付けられた状態で、例えば第１実施例の導体板１０（主導体部）の上面の一部を覆うことにより平面視で導体板１０の外縁とオーバーラップするとともに、ＣＤの記録面金属部の内縁と平面視でオーバーラップするようにして形成される。本実施例の無線タグも第６実施例と同様、蒸着金属部がないＣＤに貼り付けられる。このとき、本実施例の無線タグのＣＤに対する貼り付けは、例えば第１実施例の無線タグを先ずＣＤのレーベル面に貼り付け、その上に図１３に示す補助導体部１５を貼り付けることでなされる。
(7) Seventh Embodiment The wireless tag of the seventh embodiment is formed from the same viewpoint as the wireless tag of the sixth embodiment. The wireless tag of the present embodiment differs from that of the sixth embodiment in the form of the auxiliary conductor portion 15. FIG. 13 shows the configuration of the wireless tag of this embodiment. As shown in FIG. 13, the wireless tag of this embodiment is in a state of being attached to a CD, for example, by covering a part of the upper surface of the conductor plate 10 (main conductor portion) of the first embodiment in a plan view. It is formed so as to overlap with the outer edge of the conductor plate 10 and to overlap with the inner edge of the metal part of the recording surface of the CD in plan view. As in the sixth embodiment, the wireless tag of this embodiment is also attached to a CD having no vapor deposition metal portion. At this time, the wireless tag of the present embodiment is attached to the CD by, for example, first attaching the wireless tag of the first embodiment to the label surface of the CD, and then attaching the auxiliary conductor portion 15 shown in FIG. Made.
（８）第８実施例
スロットの外径が、無線タグの貼付け対象のＣＤの金属部の内径以下である場合（第１実施例の無線タグ）と、ＣＤの金属部の内径より大きい場合（第２実施例の無線タグ）とで電磁結合の程度が異なるため、無線タグの有効通信距離が異なる（図６、図８参照）。他方、前述したように、発明者らの調査によれば、蒸着金属部の内径Ｄ４としてφ２０〜２７の範囲のＣＤの存在が確認されている。よって、無線タグのスロット外径をφ２０〜２７の範囲内で一意に設定したとすれば、スロットと蒸着金属部がオーバーラップするＣＤとオーバーラップしないＣＤが混在することになり、ＣＤ毎に無線タグの有効通信距離が異なることになる。そこで、本実施例の無線タグでは、ＣＤの蒸着金属部の内径に依存しない安定した有効通信距離を得るために、補助導体部が利用される。
(8) Eighth Example When the outer diameter of the slot is equal to or less than the inner diameter of the metal part of the CD to which the wireless tag is attached (the wireless tag of the first example), Since the degree of electromagnetic coupling is different from that of the wireless tag of the second embodiment, the effective communication distance of the wireless tag is different (see FIGS. 6 and 8). On the other hand, as described above, according to the investigation by the inventors, the presence of CD in the range of φ20 to 27 is confirmed as the inner diameter D4 of the deposited metal part. Therefore, if the slot outer diameter of the wireless tag is uniquely set within the range of φ20 to 27, CDs in which the slot and the deposited metal part overlap each other and CDs that do not overlap are mixed, and each CD is wireless. The effective communication distance of the tag will be different. Therefore, in the wireless tag of this embodiment, the auxiliary conductor portion is used in order to obtain a stable effective communication distance that does not depend on the inner diameter of the vapor deposition metal portion of the CD.
本実施例の無線タグを図１４に示す。この無線タグは第６実施例と同様の補助導体部１５を備えるが、第６実施例の場合と比較して補助導体部１５の内径が異なる。本実施例では、補助導体部１５の内径は、スロット外径よりも小さく設定される。これにより、補助導体部１５がＣＤに貼り付けられた場合、本実施例の無線タグのスロットは、ＣＤの蒸着金属部の内径に関わらず常に補助導体部１５とオーバーラップすることになる。補助導体部１５の外径は、第６実施例と同じく、ＣＤの記録面金属部の内縁とオーバーラップするようにして形成される。また、第２実施例同様、有効通信距離を確保するためにスロットの形状（図７のθ）が適切に設定される。 A wireless tag of this embodiment is shown in FIG. This wireless tag includes an auxiliary conductor portion 15 similar to that of the sixth embodiment, but the inner diameter of the auxiliary conductor portion 15 is different from that of the sixth embodiment. In the present embodiment, the inner diameter of the auxiliary conductor portion 15 is set smaller than the outer diameter of the slot. Thus, when the auxiliary conductor portion 15 is attached to the CD, the slot of the wireless tag of this embodiment always overlaps with the auxiliary conductor portion 15 regardless of the inner diameter of the vapor deposition metal portion of the CD. The outer diameter of the auxiliary conductor portion 15 is formed so as to overlap with the inner edge of the CD recording surface metal portion, as in the sixth embodiment. As in the second embodiment, the slot shape (θ in FIG. 7) is appropriately set in order to ensure an effective communication distance.
上述したように、本実施例の無線タグでは、ＣＤのタイプ（蒸着金属部の有無、蒸着金属部の内径の大きさ）に関わらず、ＣＤに貼り付けた場合に常に補助導体部１５がスロットとオーバーラップする。そのため、スロットの形状（図７のθ）を適切に設定することで、無線タグの有効通信距離がＣＤのタイプに依存せずに安定する。 As described above, in the wireless tag of this embodiment, the auxiliary conductor portion 15 is always a slot when affixed to a CD, regardless of the type of CD (the presence or absence of a vapor deposition metal portion, the inner diameter of the vapor deposition metal portion). And overlap. Therefore, by setting the slot shape (θ in FIG. 7) appropriately, the effective communication distance of the wireless tag is stabilized without depending on the CD type.
（９）第９実施例
上述した第１〜第８実施例の無線タグでは、スロット１１の形態が全体として円弧状のメアンダ形状をなしている場合について説明したが、これに限られない。図１５には、本実施例の無線タグにおいて、スロット１１の様々な変形例に係る形状が示される。
図１５（ａ）に示すスロット１１の形態は、給電部から両側に延びており、全体として円弧状の非メアンダ形状となっている。図１５（ａ）に示すスロット１１は全体として正確な円弧となっているが、多少蛇行した形状でも構わない。スロット１１の全長が所要のインダクタンスを確保するため、図１５（ａ）に示すように全長を調整するための折り返し部を設けてもよい。
図１５（ｂ）に示すスロット１１の形態は、２．４５ＧＨｚの無線周波数を用いる場合の形状である。この場合、９５３ＭＨｚの場合と比較して波長が短くなるため、メアンダ形状にせずに済む。
図１５（ｃ）に示すスロット１１の形態は、上述した各実施例と同様にメアンダ形状であるが、このメアンダ形状は複数のランダムな形の略Ｕ字形状部が円弧状に連結されて形成されている。ランダムな形の略Ｕ字形状部としたのは、隣接する略Ｕ字形状部のスロットの外側の導体を流れる電流の向きは逆であるものの、互いに逆向きの電流ベクトル方向が完全には平行とならず、逆向きの電流によって生ずる電磁波のキャンセル量を低減できるためである。これにより、アンテナ実効長を、例えばメアンダ形状を構成するのに正確な（ランダムでない）Ｕ字形を適用する場合と比較して長くすることができ、スロット１１の外径を小さくすることができる。
(9) Ninth Example In the above-described wireless tags of the first to eighth examples, the case where the slot 11 has an arcuate meander shape as a whole has been described, but the present invention is not limited to this. FIG. 15 shows shapes according to various modifications of the slot 11 in the wireless tag of the present embodiment.
The form of the slot 11 shown in FIG. 15A extends from the power feeding portion to both sides, and has an arcuate non-meander shape as a whole. The slot 11 shown in FIG. 15A has an accurate circular arc as a whole, but may have a somewhat serpentine shape. In order for the overall length of the slot 11 to ensure a required inductance, a folded portion for adjusting the overall length may be provided as shown in FIG.
The form of the slot 11 shown in FIG. 15B is a shape when a radio frequency of 2.45 GHz is used. In this case, since the wavelength is shorter than in the case of 953 MHz, the meander shape is not necessary.
The shape of the slot 11 shown in FIG. 15C is a meander shape as in the above-described embodiments, but this meander shape is formed by connecting a plurality of random, substantially U-shaped portions in an arc shape. Has been. Random-shaped substantially U-shaped portions are formed in such a manner that the directions of currents flowing in the conductors outside the slots of the adjacent substantially U-shaped portions are opposite, but the current vector directions opposite to each other are completely parallel. This is because the amount of cancellation of electromagnetic waves generated by the reverse current can be reduced. As a result, the effective antenna length can be increased, for example, compared to the case where an accurate (non-random) U-shape is applied to form a meander shape, and the outer diameter of the slot 11 can be reduced.
（１０）第１０実施例
第１〜第９実施例に無線タグに関し、ディスク状の記録媒体に貼り付けることを前提として説明してきたが、これに限られない。非導電部材と離間した内側の第１領域と、導電部材に近接した外側の第２領域とからなる対象部材に適用することができる。このような対象部材として典型的なのは、例えば車両用のアーム又はフレーム等の凹部のある金属部材である。このような金属部材では例えば軽量化の目的で凹部が予め設けられているため、その凹部に本実施例の無線タグを取り付ける。この場合は、第１領域が凹部に相当し、第２領域が凹部の周辺領域に相当する。無論、金属部材の軽量化の目的のために設けられた凹部に無線タグを取り付けてもよいし、金属部材の機能上の障害がない箇所に予め設けた凹部に無線タグを取り付けてもよい。
(10) Tenth Embodiment Although the wireless tag in the first to ninth embodiments has been described on the assumption that it is attached to a disk-shaped recording medium, the present invention is not limited to this. The present invention can be applied to a target member composed of an inner first region separated from a non-conductive member and an outer second region close to the conductive member. A typical example of such a target member is a metal member having a recess such as an arm or a frame for a vehicle. In such a metal member, for example, a recess is provided in advance for the purpose of weight reduction, and thus the wireless tag of the present embodiment is attached to the recess. In this case, the first region corresponds to the recess, and the second region corresponds to the peripheral region of the recess. Of course, the wireless tag may be attached to a recessed portion provided for the purpose of reducing the weight of the metal member, or the wireless tag may be attached to a recessed portion provided in advance at a location where there is no functional failure of the metal member.
図１６は、本実施例の無線タグが金属部材に取り付けられた状態を示す。本実施例の無線タグは、例えば第１実施例の無線タグに対して導体板の中央の孔部を埋めて円形にしたものとなっている。スロットアンテナを構成する導体板及びメアンダ状のスロットの寸法は、取付対象の金属部材の形状、及び無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られる目的で最適化される。
図１６において、金属部材には円筒状の凹部が設けられており、この凹部上に、全体として円形の平板状の本実施例の無線タグが取り付けられる。そのため、本実施例の無線タグの外径は、取付対象となる金属部材の凹部の径よりも大きい。金属部材に対する無線タグの取付方法は問わないが、例えば極薄の両面テープ、接着剤、シール等が取付のために使用され得る。好ましくは、メアンダ状のスロットの外径は、金属部材の凹部の径よりも小さい。無線タグの外径を極力小さくするために、前述した実施例同様、ここでもメアンダ状のスロットアンテナが適用される。
FIG. 16 shows a state where the wireless tag of this embodiment is attached to a metal member. The wireless tag of the present embodiment is, for example, a circular shape in which the hole in the center of the conductor plate is filled with respect to the wireless tag of the first embodiment. The dimensions of the conductor plate and meander-shaped slot constituting the slot antenna are optimized for the purpose of obtaining the shape of the metal member to be attached and the inductance that resonates at a predetermined radio frequency with the wireless IC chip. The
In FIG. 16, the metal member is provided with a cylindrical recess, and the radio tag of the present embodiment having a circular plate shape as a whole is mounted on the recess. Therefore, the outer diameter of the wireless tag of the present embodiment is larger than the diameter of the concave portion of the metal member to be attached. The method of attaching the wireless tag to the metal member is not limited, but for example, an ultra-thin double-sided tape, an adhesive, a seal or the like can be used for attachment. Preferably, the outer diameter of the meander-shaped slot is smaller than the diameter of the concave portion of the metal member. In order to make the outer diameter of the wireless tag as small as possible, a meander-shaped slot antenna is applied here as in the above-described embodiment.
図１６に示すオーバーラップの部分は、無線タグの金属部材への取り付けのためのみならず、無線タグのスロットアンテナを構成する導体板との電磁結合を生じさせる。すなわち、このオーバーラップにより、高周波帯において、無線タグの導体板が金属部材とが電磁結合するため、金属部材を導体板の一部として機能させることができ、スロットから十分に電波を放射させることができる。一方、この無線タグが金属部材に取り付けられた場合、スロットの下部には金属部材の凹部が配置されることになり、スロットアンテナから放射される電波を遮蔽することが防止される。それゆえ、本実施例の無線タグはそれ自体コンパクトではあるが、リーダライタ（図示せず）との間の十分な有効通信距離を確保することができる。 The overlap portion shown in FIG. 16 causes not only the attachment of the wireless tag to the metal member but also electromagnetic coupling with the conductor plate constituting the slot antenna of the wireless tag. In other words, because of this overlap, the conductor plate of the wireless tag is electromagnetically coupled to the metal member in the high frequency band, so that the metal member can function as a part of the conductor plate and sufficiently emit radio waves from the slot. Can do. On the other hand, when the wireless tag is attached to a metal member, a concave portion of the metal member is disposed at the lower part of the slot, and it is possible to prevent the radio wave radiated from the slot antenna from being shielded. Therefore, although the wireless tag of this embodiment is compact in itself, a sufficient effective communication distance with a reader / writer (not shown) can be secured.
以上、対象部材として金属部材に本実施例の無線タグが取り付けられる場合について説明したが、対象部材として金属部材のみならず、所定の大きさの凹部、空洞部、孔部が存在する導電性部材に対して適用可能であることは明らかである。例えば、図１６に示す無線タグは、円筒状の金属部材の凹部に適合するように円形の無線タグ（すなわち、円形の導体板）としたが、これに限られない。無線タグの全体の形態は、対象部材の形態に対して最適化されうる。例えば、対象部材の凹部が直方体形状であれば、無線タグの全体の形態は矩形になりうる。 As described above, the case where the wireless tag of the present embodiment is attached to the metal member as the target member has been described. However, the target member is not only the metal member but also a conductive member having a predetermined size of a recess, a cavity, and a hole. It is clear that this is applicable. For example, the wireless tag illustrated in FIG. 16 is a circular wireless tag (that is, a circular conductor plate) so as to fit into the concave portion of the cylindrical metal member, but is not limited thereto. The overall form of the wireless tag can be optimized with respect to the form of the target member. For example, if the concave portion of the target member is a rectangular parallelepiped shape, the entire form of the wireless tag can be rectangular.
また、第１０実施例の無線タグに対して、第１〜第９実施例の無線タグに適宜適用できることは言うまでもない。例えば、スロットは、無線タグを金属部材の内側に取り付けた場合に金属部材の第１領域、すなわち凹部にスロット全体が収容されるようにして形成されることが好ましい。また、導体板の外縁で導体板とオーバーラップするように形成され、導体板の導体領域を拡大するための補助導体部、をさらに備けることで、凹部の大きさが異なる複数の金属部材に対し、１種類の無線タグを適用することができる。 Needless to say, the wireless tag of the tenth embodiment can be appropriately applied to the wireless tags of the first to ninth embodiments. For example, the slot is preferably formed so that the entire slot is accommodated in the first region of the metal member, that is, the recess when the wireless tag is attached to the inside of the metal member. In addition, by providing an auxiliary conductor portion that is formed so as to overlap the conductor plate at the outer edge of the conductor plate and that expands the conductor region of the conductor plate, a plurality of metal members having different sizes of the recesses can be provided. On the other hand, one type of wireless tag can be applied.
（１１）第１１実施例
上記第３実施例（図９参照）では、蒸着金属部がないＣＤに対して無線タグを取り付ける場合に、導体板１０とＣＤの記録面金属部とをオーバーラップさせるための延長部１０１を４箇所設けた例について説明した。これに対して、第１１実施例では、第３実施例の無線タグのさらに好ましい例について説明する。
第１１実施例の無線タグを図１７に示す。図１７は、第１１実施例の無線タグを、蒸着金属部がないＣＤに貼り付けた状態を示している。図１７に示すように、本実施例の無線タグの導体板１０は、第１導体部１１０と第２導体部１２０（第３実施例の延長部１０１に相当するもの）を備えている。第１導体部１１０は、スロット１１が形成され、ＣＤの記録面金属部（第２領域）の内径よりも小さい外径を有する環状の導体部材である。第２導体部１２０は、給電部２とＣＤの中心を結ぶ線（Ｂ−Ｂ線）に沿って、ＣＤの外縁に向かって第１導体部１１０から相対する２方向に延びており、ＣＤの記録面金属部とオーバーラップするように形成された導体部材である。
(11) Eleventh Embodiment In the third embodiment (see FIG. 9), when the wireless tag is attached to a CD having no vapor deposition metal portion, the conductor plate 10 and the recording surface metal portion of the CD are overlapped. The example which provided the extension part 101 for four places was demonstrated. On the other hand, in the eleventh embodiment, a more preferable example of the wireless tag of the third embodiment will be described.
The wireless tag of the eleventh embodiment is shown in FIG. FIG. 17 shows a state where the wireless tag of the eleventh embodiment is attached to a CD having no vapor deposition metal part. As shown in FIG. 17, the conductor plate 10 of the wireless tag of the present embodiment includes a first conductor portion 110 and a second conductor portion 120 (corresponding to the extension portion 101 of the third embodiment). The first conductor portion 110 is an annular conductor member in which the slot 11 is formed and has an outer diameter smaller than the inner diameter of the CD recording surface metal portion (second region). The second conductor portion 120 extends in two opposite directions from the first conductor portion 110 toward the outer edge of the CD along a line (BB line) connecting the feeding portion 2 and the center of the CD. It is a conductor member formed so as to overlap the recording surface metal part.
本実施例の無線タグをＣＤに貼り付けた場合、導体板１０の第１導体部１１０とＣＤの記録面金属部との間には、平面視で見て周方向に非導体部分が設けられることになる。よって、第２導体部１２０とＣＤの記録面金属部の２箇所のオーバーラップの間においてダイポールアンテナが形成されるとともに、第２導体部１２０とオーバーラップするＣＤの記録面金属部全体が無線タグと電磁結合することによって電磁波が放射されるようになる。すなわち、本実施例の場合、給電部２とＣＤの中心を結ぶ線に沿った導体板１０の全長は、例えば約５２ｍｍ程度であるが、オーバーラップ部分を介してＣＤ（外径φ１２０）全体で動作させることで、国内でのＲＦＩＤシステムで使用される９５２〜９５４ＭＨｚのλ／２（約１５０ｍｍ）にダイポールアンテナの実効長を近付けることができるようになる。そのため、スロット１１によるスロットアンテナとしての動作のみの場合よりも、通信距離を拡張することができる。また、第３実施例（図９参照）の場合と比較して導体板１０の面積がさらに小さくなり、低コスト化に寄与する。記録面金属部の内周側に蒸着金属部が存在して平面視で蒸着金属部と導体板１０がオーバーラップするようなＣＤについては、上述したダイポールアンテナが形成されず、スロットアンテナのみが動作することになる。
なお、本実施例の場合の好ましい寸法例を挙げれば、第２導体部１２０の幅は１０ｍｍ、Ｂ−Ｂ線に沿った第２導体部１２０の長さは１２〜１３ｍｍ、第２導体部１２０とＣＤの記録面金属部のオーバーラップ量は４ｍｍである。
When the wireless tag of this embodiment is attached to a CD, a non-conductor portion is provided in the circumferential direction between the first conductor portion 110 of the conductor plate 10 and the recording surface metal portion of the CD in a plan view. It will be. Therefore, a dipole antenna is formed between two overlapping portions of the second conductor portion 120 and the CD recording surface metal portion, and the entire recording surface metal portion of the CD overlapping the second conductor portion 120 is a wireless tag. Electromagnetic wave is radiated by electromagnetic coupling. That is, in the case of the present embodiment, the total length of the conductor plate 10 along the line connecting the power feeding unit 2 and the center of the CD is, for example, about 52 mm, but the entire CD (outer diameter φ120) through the overlap portion. By operating, the effective length of the dipole antenna can be brought close to λ / 2 (about 150 mm) of 952 to 954 MHz used in the RFID system in Japan. Therefore, the communication distance can be extended as compared with the case where only the operation of the slot 11 as a slot antenna is performed. Further, the area of the conductor plate 10 is further reduced compared to the case of the third embodiment (see FIG. 9), which contributes to cost reduction. For a CD in which a vapor-deposited metal portion exists on the inner peripheral side of the recording surface metal portion and the vapor-deposited metal portion and the conductor plate 10 overlap in plan view, the above-described dipole antenna is not formed and only the slot antenna operates. Will do.
In addition, if the preferable dimension example in the case of a present Example is given, the width | variety of the 2nd conductor part 120 will be 10 mm, the length of the 2nd conductor part 120 along BB line will be 12-13 mm, and the 2nd conductor part 120 will be described. And the CD recording surface metal part overlap amount is 4 mm.
（１２）第１２実施例
次に、第１２実施例の無線タグについて、図１８を参照して説明する。
図１８に示すように、本実施例の無線タグは、第１１実施例の無線タグとは、第２導体部１２０において、第１導体部１１０からＣＤの記録面金属部の間がメアンダ状で形成されている点で異なる。これにより、第２導体部１２０を実質的により長くすることができるため、第１１実施例で述べたダイポールアンテナとしての動作をより高めるようにすることができる。すなわち、上述したように国内でのＲＦＩＤシステムで使用される場合のλ／２が約１５０ｍｍであるが、第２導体部１２０をメアンダ状とすることで、導体板１０によって形成されるダイポールアンテナの全長を１５０ｍｍに近付けることができるようになる。例えば、第１１実施例では、給電部２とＣＤの中心を結ぶ線に沿った導体板１０の全長が約５２ｍｍ程度であるが、本実施例では、メアンダの線幅を１ｍｍとした場合に、導体板１０の全長を約１３０ｍｍ（実効長は１１０〜１２０ｍｍ）とすることができ、上記λ／２に近付けることができる。
なお、導体板１０の全長を上記λ／２に近付けることができるので、本実施例の無線タグはそれ単独で、すなわち、ＣＤの記録面金属部との電磁結合を考慮することなく使用することができる。例えば、本実施例の無線タグを、導電性部分を持たないＶＨＳテープのプラスチックの筐体に貼り付ける、または本などに貼り付けることなどが可能である。
(12) Twelfth Example Next, a wireless tag of a twelfth example will be described with reference to FIG.
As shown in FIG. 18, the wireless tag of the present embodiment is different from the wireless tag of the eleventh embodiment in the meander shape between the first conductor portion 110 and the CD recording surface metal portion in the second conductor portion 120. It differs in that it is formed. Thereby, since the 2nd conductor part 120 can be made substantially longer, the operation | movement as a dipole antenna described in 11th Example can be improved more. That is, as described above, λ / 2 when used in an RFID system in Japan is about 150 mm. However, by forming the second conductor portion 120 into a meander shape, the dipole antenna formed by the conductor plate 10 is used. The total length can be brought close to 150 mm. For example, in the eleventh embodiment, the total length of the conductor plate 10 along the line connecting the feeding portion 2 and the center of the CD is about 52 mm, but in this embodiment, when the meander line width is 1 mm, The total length of the conductor plate 10 can be about 130 mm (effective length is 110 to 120 mm), and can be close to the above-mentioned λ / 2.
Since the overall length of the conductor plate 10 can be made close to the above-mentioned λ / 2, the wireless tag of this embodiment can be used alone, that is, without considering electromagnetic coupling with the recording surface metal part of the CD. Can do. For example, the wireless tag of this embodiment can be attached to a plastic housing of a VHS tape that does not have a conductive portion, or can be attached to a book or the like.
なお、本実施例の無線タグでは、第２導体部１２０において、第１導体部１１０からＣＤの記録面金属部の間がメアンダ状で形成されているが、ＣＤの記録面金属部とオーバーラップする部分はメアンダ形状にしないようにすることが好ましい。つまり、このオーバーラップする部分をもメアンダ状にすると、第１１実施例と同じ電磁結合性能を維持するために、すなわち実質的なオーバーラップ量を確保するために無線タグの全長が長くなってしまうためである。 In the wireless tag of the present embodiment, the second conductor portion 120 is formed in a meander shape from the first conductor portion 110 to the CD recording surface metal portion, but overlaps with the CD recording surface metal portion. It is preferable not to make the portion to be meandered. In other words, if this overlapping portion is also formed in a meander shape, the entire length of the wireless tag becomes long in order to maintain the same electromagnetic coupling performance as that of the eleventh embodiment, that is, to secure a substantial overlap amount. Because.
（１３）第１３実施例
次に、第１３実施例の無線タグについて、図１９を参照して説明する。
図１９に示すように、本実施例の無線タグは、第１１実施例の無線タグとは、第２導体部１２０において、ＣＤの記録面金属部とオーバーラップする部分が記録面金属部の内周に沿って延びている点で異なる。このオーバーラップ部分を記録面金属部の内周に沿って延長させているのは、無線タグ全体を全体的にコンパクトにするためである。このように第２導体部１２０を形成することで、第１２実施例と同様に、第２導体部１２０を実質的により長くすることができるため、第１１実施例で述べたダイポールアンテナとしての動作をより高めるようにすることができる。
本実施例の無線タグは、第２導体部１２０の長さを十分に確保しようとする点において第１２実施例と同一の考え方に基づいたものであるが、第１２実施例のように第２導体部１２０をメアンダ形状により成形していないため、通信性能上有利である。つまり、第１２実施例のように第２導体部１２０をメアンダ形状により成形した場合には、メアンダの略Ｖ字部分において電流の向きが逆向きに近くなることによる電気的損失が生ずるが、本実施例のものではそのような損失が生じない。そのため、本実施例の無線タグは、第１２実施例のものよりも通信距離を長くすることができる。
(13) Thirteenth Embodiment Next, a wireless tag according to a thirteenth embodiment will be described with reference to FIG.
As shown in FIG. 19, the wireless tag of the present embodiment is different from the wireless tag of the eleventh embodiment in that the portion of the second conductor portion 120 that overlaps the recording surface metal portion of the CD is within the recording surface metal portion. It differs in that it extends along the circumference. The reason why the overlap portion is extended along the inner periphery of the recording surface metal portion is to make the entire wireless tag compact. By forming the second conductor portion 120 in this way, the second conductor portion 120 can be made substantially longer as in the twelfth embodiment. Therefore, the operation as the dipole antenna described in the eleventh embodiment is performed. Can be made higher.
The wireless tag of the present embodiment is based on the same idea as the twelfth embodiment in that it is intended to ensure a sufficient length of the second conductor portion 120, but the second tag as in the twelfth embodiment. Since the conductor part 120 is not formed with a meander shape, it is advantageous in terms of communication performance. That is, when the second conductor 120 is formed in a meander shape as in the twelfth embodiment, an electrical loss occurs due to the direction of the current being close to the opposite direction in the substantially V-shaped portion of the meander. Such loss does not occur in the embodiment. Therefore, the wireless tag of the present embodiment can have a longer communication distance than that of the twelfth embodiment.
なお、本実施例の無線タグは、ＣＤの記録面金属部とオーバーラップする部分を、導体板１０の実効長がダイポールアンテナとして適切に動作するλ／２になるまで、記録面金属部の内周に沿って延長させることができる。この点でも、メアンダ形状を用いた第１２実施例のものよりも設計上の制約が少ないと言える。 In the wireless tag of this embodiment, the portion of the recording surface metal part overlaps the recording surface metal part of the CD until the effective length of the conductor plate 10 is appropriately λ / 2 that operates as a dipole antenna. It can be extended along the circumference. Also in this respect, it can be said that there are fewer design restrictions than those in the twelfth embodiment using the meander shape.
（１４）第１４実施例
次に、第１４実施例の無線タグについて、図２０を参照して説明する。
図２０に示すように、本実施例の無線タグは、上述した第１２および第１３実施例の無線タグの特徴を共に備えたものである。すなわち、本実施例の無線タグは、第２導体部１２０において、第１導体部１１０からＣＤの記録面金属部の間がメアンダ状で形成され、かつ、ＣＤの記録面金属部とオーバーラップする部分が記録面金属部の内周に沿って延びている。本実施例の無線タグは、第１２実施例の無線タグに対する改良型と捉えることもできる。すなわち、本実施例の無線タグは、導体板１０がダイポールアンテナとして適切に動作するための実効長を確保するのに、ＣＤの記録面金属部とオーバーラップする部分が記録面金属部の内周に沿って延びている分、メアンダ形状の部分の長さを第１２実施例の場合ほど必要とならない。その結果、第１２実施例の場合よりもメアンダ形状の部分の折り返し回数を減らすことができ、メアンダ形状の部分の電気的損失が抑制される。
(14) Fourteenth Embodiment Next, a wireless tag according to a fourteenth embodiment will be described with reference to FIG.
As shown in FIG. 20, the wireless tag of this embodiment has both the features of the wireless tags of the twelfth and thirteenth embodiments described above. That is, in the second embodiment, the wireless tag of this embodiment has a meander shape between the first conductor portion 110 and the CD recording surface metal portion in the second conductor portion 120 and overlaps with the CD recording surface metal portion. The portion extends along the inner periphery of the recording surface metal portion. The wireless tag of the present embodiment can also be regarded as an improved version of the wireless tag of the twelfth embodiment. That is, in the wireless tag of this embodiment, in order to ensure the effective length for the conductor plate 10 to operate properly as a dipole antenna, the portion overlapping the recording surface metal portion of the CD is the inner periphery of the recording surface metal portion. Accordingly, the length of the meander-shaped portion is not required as much as in the twelfth embodiment. As a result, the number of turns of the meander-shaped portion can be reduced as compared with the case of the twelfth embodiment, and the electrical loss of the meander-shaped portion is suppressed.
本発明の複数の実施例について詳細に説明したが、本発明の無線タグは上記実施例に限定されず、本発明の主旨を逸脱しない範囲において、種々の改良や変更をしてもよいのは勿論である。例えば、上述した各実施例では、無線タグの貼り付け対象がＣＤである場合を主として述べてきたが、ＣＤと同種の構造の他の物品、例えばＤＶＤ(Digital Versatile Disc)、ＢＤ(Blu-ray Disc;登録商標)等に応じて本発明の無線タグを適宜最適化しうることは当業者に理解される。 Although a plurality of embodiments of the present invention have been described in detail, the wireless tag of the present invention is not limited to the above embodiments, and various improvements and modifications may be made without departing from the spirit of the present invention. Of course. For example, in each of the above-described embodiments, the case in which the wireless tag is attached to a CD has been mainly described. However, other articles having the same type of structure as a CD, such as a DVD (Digital Versatile Disc), a BD (Blu-ray) It will be understood by those skilled in the art that the wireless tag of the present invention can be optimized as appropriate in accordance with Disc;
以上の各実施形態に関し、さらに以下の付記を開示する。 Regarding the above embodiments, the following additional notes are disclosed.
（付記１）
非導電部材からなる内周側の第１領域と、導電部材を含む外周側の第２領域とからなるディスク状の記録媒体、に取り付けられる無線タグであって、
無線ＩＣチップに接続される給電部と、
スロットが設けられた導体板を含み、前記給電部から給電されるスロットアンテナと、
を備え、
前記導体板は、無線タグを記録媒体の内周側に取り付けた場合に、少なくとも一部が記録媒体の前記第２領域とオーバーラップするように形成され、
前記スロットの長さは、前記スロットアンテナが前記無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られるように設定される、
無線タグ。（１）
(Appendix 1)
A wireless tag attached to a disk-shaped recording medium composed of a first area on the inner circumference side made of a non-conductive member and a second area on the outer circumference side containing a conductive member,
A power feeding unit connected to the wireless IC chip;
A slot antenna including a conductor plate provided with a slot, and fed from the feeding section;
With
The conductor plate is formed so that at least a part thereof overlaps the second region of the recording medium when the wireless tag is attached to the inner peripheral side of the recording medium.
The length of the slot is set so that an inductance is obtained such that the slot antenna resonates with the wireless IC chip at a predetermined radio frequency.
Wireless tag. (1)
（付記２）
前記スロットは、無線タグを記録媒体の内周側に取り付けた場合に記録媒体の前記第１領域にスロット全体が収容されるようにして形成される、
付記１に記載された無線タグ。（２）
(Appendix 2)
The slot is formed so that the entire slot is accommodated in the first region of the recording medium when the wireless tag is attached to the inner peripheral side of the recording medium.
The wireless tag described in appendix 1. (2)
（付記３）
前記スロットは、前記給電部から両側に延びており、全体として円弧状のメアンダ形状である、
付記１又は２に記載された無線タグ。（３）
(Appendix 3)
The slot extends on both sides from the power feeding portion, and has a circular arc meander shape as a whole.
The wireless tag described in appendix 1 or 2. (3)
（付記４）
前記スロットは、前記給電部から両側に延びており、全体として円弧状の非メアンダ形状である、
付記１又は２に記載された無線タグ。（４）
(Appendix 4)
The slot extends on both sides from the power feeding portion, and has a generally arc-shaped non-meander shape.
The wireless tag described in appendix 1 or 2. (4)
（付記５）
前記スロットは、長さを調整するための折り返し部を有する、
付記４に記載された無線タグ。（５）
(Appendix 5)
The slot has a folded portion for adjusting the length,
The wireless tag described in appendix 4. (5)
（付記６）
前記導体板は、
前記スロットが設けられた環状の主導体部と、
前記導体本体部とは内周側でオーバーラップし、かつ記録媒体の前記第２領域とは外周側でオーバーラップする環状の補助導体部と、を有する、
付記１〜５のいずれかに記載された無線タグ。（６）
(Appendix 6)
The conductor plate is
An annular main conductor provided with the slot;
An annular auxiliary conductor portion that overlaps with the conductor main body portion on the inner peripheral side and overlaps with the second region of the recording medium on the outer peripheral side;
The wireless tag described in any one of appendices 1-5. (6)
（付記７）
前記導体板は、
前記スロットが形成され、記録媒体の前記第２領域の内径よりも小さい外径を有する環状の第１導体部と、
前記給電部と記録媒体の中心を結ぶ線に沿って、記録媒体の外縁に向かって前記第１導体部から相対する２方向に延びており、前記第２領域とオーバーラップするように形成された第２導体部と、を有する、
付記１〜５のいずれかに記載された無線タグ。（７）
(Appendix 7)
The conductor plate is
An annular first conductor portion having the slot formed therein and having an outer diameter smaller than the inner diameter of the second region of the recording medium;
Along the line connecting the power feeding portion and the center of the recording medium, the recording medium extends in two opposite directions from the first conductor portion toward the outer edge of the recording medium, and is formed so as to overlap the second region. A second conductor portion,
The wireless tag described in any one of appendices 1-5. (7)
（付記８）
前記第２導体部において、前記第１導体部から前記第２領域の間がメアンダ状で形成されている、
付記７に記載された無線タグ。（８）
(Appendix 8)
In the second conductor portion, a space between the first conductor portion and the second region is formed in a meander shape.
The wireless tag described in appendix 7. (8)
（付記９）
前記第２導体部において、前記第２領域とオーバーラップする部分が前記第２領域の内周に沿って延びている、
付記７または８に記載された無線タグ。（９）
(Appendix 9)
In the second conductor portion, a portion that overlaps the second region extends along the inner periphery of the second region.
The wireless tag described in appendix 7 or 8. (9)
（付記１０）
非導電部材と離間した内側の第１領域と、導電部材に近接した外側の第２領域とからなる対象部材、に取り付けられる無線タグであって、
無線ＩＣチップに接続される給電部と、
スロットが設けられた導体板を含み、前記給電部から給電されるスロットアンテナと、
を備え、
前記導体板は、無線タグを対象部材の内側に取り付けた場合に、少なくとも一部が対象部材の前記第２領域とオーバーラップするように形成され、
前記スロットの長さは、前記スロットアンテナが前記無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られるように設定される、
無線タグ。
(Appendix 10)
A wireless tag attached to a target member composed of an inner first region separated from a non-conductive member and an outer second region close to the conductive member,
A power feeding unit connected to the wireless IC chip;
A slot antenna including a conductor plate provided with a slot, and fed from the feeding section;
With
The conductor plate is formed so that at least a portion thereof overlaps the second region of the target member when the wireless tag is attached to the inside of the target member.
The length of the slot is set so that an inductance is obtained such that the slot antenna resonates with the wireless IC chip at a predetermined radio frequency.
Wireless tag.
（付記１１）
前記スロットは、無線タグを対象部材の内側に取り付けた場合に対象部材の前記第１領域にスロット全体が収容されるようにして形成される、
付記１０に記載された無線タグ。
(Appendix 11)
The slot is formed such that when the wireless tag is attached to the inside of the target member, the entire slot is accommodated in the first region of the target member.
The wireless tag described in appendix 10.
（付記１２）
前記導体板の外縁で導体板とオーバーラップするように形成され、導体板の導体領域を拡大するための補助導体部、をさらに備えた、
付記１０又は１１に記載された無線タグ。
(Appendix 12)
An auxiliary conductor portion that is formed so as to overlap with the conductor plate at the outer edge of the conductor plate, and further expands the conductor region of the conductor plate;
The wireless tag described in appendix 10 or 11.
２…給電部
１０…導体板
１１…スロット
2 ... Feeding part 10 ... Conductor plate 11 ... Slot
Claims (8)
無線ＩＣチップに接続される給電部と、
スロットが設けられた導体板を含み、前記給電部から給電されるスロットアンテナと、
を備え、
前記導体板は、
前記スロットが設けられた環状の主導体部と、
前記主導体部と内周側でオーバーラップし、かつ記録媒体の前記第２領域とは外周側でオーバーラップする環状の補助導体部と、を有し、かつ、
無線タグを記録媒体の内周側に取り付けた場合に、少なくとも一部が記録媒体の前記第２領域とオーバーラップするように形成され、
前記スロットの長さは、前記スロットアンテナが前記無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られるように設定される、
無線タグ。 A wireless tag attached to a disk-shaped recording medium composed of a first area on the inner circumference side made of a non-conductive member and a second area on the outer circumference side containing a conductive member,
A power feeding unit connected to the wireless IC chip;
A slot antenna including a conductor plate provided with a slot, and fed from the feeding section;
With
The conductor plate is
An annular main conductor provided with the slot;
The overlap at the main body portion and the inner peripheral side, and has an auxiliary conductive portion of the annular overlapping the outer peripheral side to the second area of the recording medium, and,
When the wireless tag is attached to the inner peripheral side of the recording medium, at least a part is formed so as to overlap the second region of the recording medium,
The length of the slot is set so that an inductance is obtained such that the slot antenna resonates with the wireless IC chip at a predetermined radio frequency.
Wireless tag.
無線ＩＣチップに接続される給電部と、
スロットが設けられた導体板を含み、前記給電部から給電されるスロットアンテナと、を備え、
前記導体板は、
前記スロットが形成され、記録媒体の前記第２領域の内径よりも小さい外径を有する環状の第１導体部と、
前記給電部と記録媒体の中心を結ぶ線に沿って、記録媒体の外縁に向かって前記第１導体部から相対する２方向に延びており、前記第２領域とオーバーラップするように形成された第２導体部と、を有し、かつ、
無線タグを記録媒体の内周側に取り付けた場合に、少なくとも一部が記録媒体の前記第２領域とオーバーラップするように形成され、
前記スロットの長さは、前記スロットアンテナが前記無線ＩＣチップとの間で所定の無線周波数で共振するようなインダクタンスが得られるように設定される、
無線タグ。 A wireless tag attached to a disk-shaped recording medium composed of a first area on the inner circumference side made of a non-conductive member and a second area on the outer circumference side containing a conductive member,
A power feeding unit connected to the wireless IC chip;
Including a conductor plate provided with a slot, and a slot antenna fed from the feeding section,
The conductor plate is
An annular first conductor portion having the slot formed therein and having an outer diameter smaller than the inner diameter of the second region of the recording medium;
Along the line connecting the power feeding portion and the center of the recording medium, the recording medium extends in two opposite directions from the first conductor portion toward the outer edge of the recording medium, and is formed so as to overlap the second region. A second conductor portion, and
When the wireless tag is attached to the inner peripheral side of the recording medium, at least a part is formed so as to overlap the second region of the recording medium,
The length of the slot is set so that an inductance is obtained such that the slot antenna resonates with the wireless IC chip at a predetermined radio frequency.
Wireless tag.
請求項２に記載された無線タグ。 In the second conductor portion, a space between the first conductor portion and the second region is formed in a meander shape.
The wireless tag according to claim 2.
請求項２または３に記載された無線タグ。 In the second conductor portion, a portion that overlaps the second region extends along the inner periphery of the second region.
The wireless tag according to claim 2 or 3.
請求項１〜４のいずれかに記載された無線タグ。 The slot is formed so that the entire slot is accommodated in the first region of the recording medium when the wireless tag is attached to the inner peripheral side of the recording medium.
The wireless tag according to claim 1.
請求項１〜５のいずれかに記載された無線タグ。 The slot has a meander shape as a whole,
The wireless tag according to claim 1.
請求項１〜５に記載された無線タグ。 The slot is generally non-meander shaped,
The wireless tag according to claim 1.
請求項７に記載された無線タグ。 The slot has a folded portion for adjusting the length,
The wireless tag according to claim 7.
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| EP10194650.7A EP2341468B1 (en) | 2009-12-28 | 2010-12-13 | Wireless tag |
| TW099144942A TWI445248B (en) | 2009-12-28 | 2010-12-21 | Wireless tag |
| KR1020100135913A KR101145077B1 (en) | 2009-12-28 | 2010-12-27 | Wireless tag |
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| JP6082252B2 (en) * | 2013-01-10 | 2017-02-15 | トッパン・フォームズ株式会社 | Non-contact type data receiving / transmitting body, disk-shaped recording medium |
| US11101567B2 (en) * | 2015-12-29 | 2021-08-24 | Checkpoint Systems, Inc. | Miniaturized planar inverted folded antenna (PIFA) for mountable UHF tags design |
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| US10840597B2 (en) * | 2017-03-14 | 2020-11-17 | Hall Labs Llc | Broadband microstrip antenna |
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